<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
    <style>
        .placeholder {
            background: #00B7FF;
            width: 100%;
            height: 300px;
            border: 5px solid ghostwhite;
        }

        img {
            width: 200px;
            height: 200px;
        }

        .img_container {
            display: flex;
            justify-content: space-between;
        }
    </style>
</head>
<body>
<div class="img_container">
    <img src="https://file.digitaling.com/eImg/uimages/20151019/1445249706879614.gif"
         data-src="https://cn.vuejs.org/images/logo.png" class="get_bounding_rect">
    <span>←getBoundClientRect&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;mutationObserver→</span>
    <img src="https://file.digitaling.com/eImg/uimages/20151019/1445249706879614.gif"
         data-src="https://cdn.auth0.com/blog/react-js/react.png" class="intersection_observer">
</div>
<div class="placeholder"></div>
<div class="placeholder"></div>
<div class="placeholder"></div>
<div class="placeholder"></div>
<div class="img_container">
    <img src="https://file.digitaling.com/eImg/uimages/20151019/1445249706879614.gif"
         data-src="https://cn.vuejs.org/images/logo.png" class="get_bounding_rect">
    <span>←getBoundClientRect&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;mutationObserver→</span>
    <img src="https://file.digitaling.com/eImg/uimages/20151019/1445249706879614.gif"
         data-src="https://cdn.auth0.com/blog/react-js/react.png" class="intersection_observer">
</div>
<div class="placeholder"></div>

<div class="placeholder"></div>
<div class="placeholder"></div>
<div class="placeholder"></div>
<div class="placeholder"></div>
<div class="img_container">
    <img src="https://file.digitaling.com/eImg/uimages/20151019/1445249706879614.gif"
         data-src="https://cn.vuejs.org/images/logo.png" class="get_bounding_rect">
    <span>←getBoundClientRect&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;mutationObserver→</span>
    <img src="https://file.digitaling.com/eImg/uimages/20151019/1445249706879614.gif"
         data-src="https://cdn.auth0.com/blog/react-js/react.png" class="intersection_observer">
</div>
<div class="placeholder"></div>
<script src="throttle.js"></script>
<script src="lazyLoad.js"></script>
</body>
</html>
